Github - Jira - Pull request - linking multiple tickets

[Mahesh Kannan Thangavelu]

I am a non technical Newbie for Jira. 

We used to work on Github where if the developer works on multiple issues done on the same branch (Same pull request), it is easy to quickly figure out the multiple issue numbers from Pull request. Also from any Issue, the pull request is also visible. So, this gave a clear idea of the list of Issues being covered in a branch when testing etc.

With Jira being introduced, unable to figure out which ticket belong in which branch. Should the developer work on a branch per ticket? Can't multiple tickets be dealt with in the same branch / Pull request?